package com.example.goodpet.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SecurityUtils {

    public static String MD5(String sourceStr) {
        String result = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString();
        } catch (NoSuchAlgorithmException e) {
            System.out.println(e);
        }
        return result;
    }

    public static String encryptPhoneNumber(String phone){
        int i = Integer.parseInt(phone.substring(10));
        int i1 = Integer.parseInt(String.valueOf(phone.charAt(i)));
        StringBuffer stringBuffer = new StringBuffer(phone);
        stringBuffer.insert(0,i1);
        return stringBuffer.toString();
    }
    public static String unEncryptPhoneNumber(String phone){
        //特判
        if (phone.equals("admin"))return phone;
        if (phone.length()==12)
        return phone.substring(1);
        else return phone;
    }

}
